• An upwelling occurs when deep ocean water rises to the surface.
  • Strong winds blow surface water away from shore.
  • This allows deeper water to flow to thesurface and take its place.
  • Upwelling also takes place along the Equator.
  • Winds blow the surface water north and south.
  • This leaves a void that deep water can upwell into.
  • The nutrient-rich water that comes up from the deep supports many living things.
  • Downwelling of cold, dense water pushes deep water along.
  • This drives thermohaline circulation.
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